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Structure and movement form of injection mold
by：Vowin Rapid Prototyping
2023-02-11
The structure and movement form of the injection mold. Although the injection mold does not have a power device, it is composed of a variety of motion actuators and many components. It also has a molding cavity and core, as well as a pouring system and a temperature control system. The parting surface of the injection mold of Shanghai Mulan Mold Processing Factory can divide the mold into two parts, the fixed mold and the movable mold. It can be fastened on the fixed template of the injection machine with a pressure plate; the movable mold part is also fastened on the injection motorized template with a pressure plate. When working, the movable platen of the injection machine presses and locks the movable mold part and the fixed mold part of the mold, that is, the mold is closed. Then, the nozzle of the injection machine injects the heated Uniform plastic melt is injected into the cavity of the mold through the barrel nozzle and the gating system of the injection mold. After the plastic melt is cooled and hardened in the mold to a certain strength, the clamping mechanism of the injection machine is released, and the parting surface of the movable mold of the injection mold is separated from the fixed mold, and the mold is opened; at the same time, the core pulling mechanism of the injection mold is completed. The core-pulling movement of the injection molded hole. The ejector rod of the ejector mechanism of the injection machine pushes the demoulding mechanism of the injection mold, and the injection molded part is ejected from the driven mold core out of the mold, that is, the ejection of the injection molded part. After the gate condensate removal mechanism removes the gate condensate, the mold can enter the next molding process of the injection molded part.
The structure of the injection mold plays a decisive role in the molding process of injection molded parts. The shape, size and precision of injection molded parts depend on the structure of the mold; the quality of injection molded parts mostly depends on the structure of the mold; whether the injection molded parts can be formed smoothly also depends mostly on the structure of the mold; the parting, core pulling and injection molding of the mold itself Whether the demoulding movement of the parts can be carried out smoothly depends entirely on the structure of the mold; the strength, stiffness, service life, processing efficiency of injection molded parts and the cost of the mold also depend on the structure of the mold.
Although the structure of injection molds is ever-changing, injection molds have basic principles and structures, which provide conditions for the standardization and serialization of molds. In the process of designing and manufacturing injection molds, Shanghai Mulan Mold Processing Factory has applied standardization and serialization of molds to simplify and optimize the design and manufacture of injection molds. Most of the mold parts have optional mold standard parts, such as mold base and push rod, which not only simplifies the design and manufacturing work, but also shortens the cycle and cost of mold design and manufacturing.
1. Classification of injection molds
Shanghai Mulan Mold Processing Factory can be divided into vertical injection mold, horizontal injection mold and angle injection mold according to the form of injection machine. In short, an injection mold is a cavity that can inject molten plastic into the mold from the mold gating system, can open and close the cavity of the molded injection molded part, and can withdraw the core that molds the molded hole of the injection molded part The hole of the injection molded part can be reset during remolding, and the mold that can eject the injection molded part from the cavity of the injection mold. Because the injection mold can form complex injection parts with high precision, and the processing efficiency is extremely high. However, due to the complexity and high manufacturing cost of injection molds, it is only suitable for large-scale production, not for small-batch processing.
Second, the main components of the injection mold structure
The structure and movement form of the injection mold. The injection mold is mainly composed of 10 parts: mold base, molding components, pouring system, temperature control system, core pulling mechanism, demoulding mechanism, limit mechanism, gate removal mechanism, guide device and installation device. composition. The composition of the injection mold.
3. Basic structure of injection mold
The basic structure of the injection mold varies with the form of the injection machine, and the following three structures are common.
① Two-plate side gate push rod demoulding horizontal injection mold structure: When the wall of the injection molded part is thick and the quality requirements are not high, the side gate and push rod can be used to withstand the bottom wall of the inner cavity of the injection molded part. The side gate is located on the bottom surface of the injection molded part, which is easy to produce flow marks and weld marks, and the setting of the push rod is easy to cause deformation of the injection molded part. The pulling rod is used to pull out the condensate in the main runner, which is beneficial to the next melt filling. The reset rod is used to push the push rod and the push plate to reset with the fixed template when the mold is closed, so as to facilitate the demoulding of the injection molded part next time.
②Three-plate point gate push rod demoulding horizontal injection mold structure: When the quality requirements of injection molded parts are high and the outer surface of injection molded parts has appearance requirements, point gates can be used. Since the form of point gate is adopted, in order to remove the gate condensate, the core is installed on the middle formwork, so it is a three-formwork structure. Matters needing attention: The guide post is long and needs to be installed in the fixed part of the mold; in order to keep the middle plate from detaching from the guide post when the mold is opened, the mold needs to be set with a limit rod to limit the position.
③Injection mold structure and movement form, push tube demoulding vertical injection mold structure: the characteristic is that the runner is perpendicular to the direction of opening and closing of the fixed and moving molds. Since the hole of the injection molded part requires core molding and push tube demoulding, Shanghai Mulan Mold Processing Factory adopts a linkage demoulding mechanism: one is to use the push tube in the push plate to demould the top of the injection molded part, and the other is to use the push tube The plate pushes the push plate, the mounting plate and the push tube. The return stroke of the demoulding mechanism is pushed by the return rod when the moving and fixed molds are closed.
The structure of the injection mold plays a decisive role in the molding process of injection molded parts. The shape, size and precision of injection molded parts depend on the structure of the mold; the quality of injection molded parts mostly depends on the structure of the mold; whether the injection molded parts can be formed smoothly also depends mostly on the structure of the mold; the parting, core pulling and injection molding of the mold itself Whether the demoulding movement of the parts can be carried out smoothly depends entirely on the structure of the mold; the strength, stiffness, service life, processing efficiency of injection molded parts and the cost of the mold also depend on the structure of the mold.
Although the structure of injection molds is ever-changing, injection molds have basic principles and structures, which provide conditions for the standardization and serialization of molds. In the process of designing and manufacturing injection molds, Shanghai Mulan Mold Processing Factory has applied standardization and serialization of molds to simplify and optimize the design and manufacture of injection molds. Most of the mold parts have optional mold standard parts, such as mold base and push rod, which not only simplifies the design and manufacturing work, but also shortens the cycle and cost of mold design and manufacturing.
1. Classification of injection molds
Shanghai Mulan Mold Processing Factory can be divided into vertical injection mold, horizontal injection mold and angle injection mold according to the form of injection machine. In short, an injection mold is a cavity that can inject molten plastic into the mold from the mold gating system, can open and close the cavity of the molded injection molded part, and can withdraw the core that molds the molded hole of the injection molded part The hole of the injection molded part can be reset during remolding, and the mold that can eject the injection molded part from the cavity of the injection mold. Because the injection mold can form complex injection parts with high precision, and the processing efficiency is extremely high. However, due to the complexity and high manufacturing cost of injection molds, it is only suitable for large-scale production, not for small-batch processing.
Second, the main components of the injection mold structure
The structure and movement form of the injection mold. The injection mold is mainly composed of 10 parts: mold base, molding components, pouring system, temperature control system, core pulling mechanism, demoulding mechanism, limit mechanism, gate removal mechanism, guide device and installation device. composition. The composition of the injection mold.
3. Basic structure of injection mold
The basic structure of the injection mold varies with the form of the injection machine, and the following three structures are common.
① Two-plate side gate push rod demoulding horizontal injection mold structure: When the wall of the injection molded part is thick and the quality requirements are not high, the side gate and push rod can be used to withstand the bottom wall of the inner cavity of the injection molded part. The side gate is located on the bottom surface of the injection molded part, which is easy to produce flow marks and weld marks, and the setting of the push rod is easy to cause deformation of the injection molded part. The pulling rod is used to pull out the condensate in the main runner, which is beneficial to the next melt filling. The reset rod is used to push the push rod and the push plate to reset with the fixed template when the mold is closed, so as to facilitate the demoulding of the injection molded part next time.
②Three-plate point gate push rod demoulding horizontal injection mold structure: When the quality requirements of injection molded parts are high and the outer surface of injection molded parts has appearance requirements, point gates can be used. Since the form of point gate is adopted, in order to remove the gate condensate, the core is installed on the middle formwork, so it is a three-formwork structure. Matters needing attention: The guide post is long and needs to be installed in the fixed part of the mold; in order to keep the middle plate from detaching from the guide post when the mold is opened, the mold needs to be set with a limit rod to limit the position.
③Injection mold structure and movement form, push tube demoulding vertical injection mold structure: the characteristic is that the runner is perpendicular to the direction of opening and closing of the fixed and moving molds. Since the hole of the injection molded part requires core molding and push tube demoulding, Shanghai Mulan Mold Processing Factory adopts a linkage demoulding mechanism: one is to use the push tube in the push plate to demould the top of the injection molded part, and the other is to use the push tube The plate pushes the push plate, the mounting plate and the push tube. The return stroke of the demoulding mechanism is pushed by the return rod when the moving and fixed molds are closed.
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